A012947 - OEIS

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A012947

sech(tan(x)+sin(x))=1-4/2!*x^2+72/4!*x^4-3318/6!*x^6+283640/8!*x^8...

1, -4, 72, -3318, 283640, -38913946, 7833273228, -2173778522118, 795497453081936, -371167668444757618, 215062106038617789684, -151501184773295673275454, 127516166752654555516090424 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	CROSSREFS	`Sequence in context: A186415 A203264 A003718 * A203535 A013066 A013102` `Adjacent sequences: A012944 A012945 A012946 * A012948 A012949 A012950`
	KEYWORD	`sign`
	AUTHOR	`Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)`

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Last modified February 16 13:12 EST 2012. Contains 205909 sequences.